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A glass slab (n - 1.5) of thickness 3.0 ...

A glass slab `(n - 1.5)` of thickness 3.0 cm is placed on an ink spot. A person looks at it from a distance 5.0 cm above the ink spot. The distance of the spot will appear to be :

A

5.0 cm

B

4.5 cm

C

4.0 cm

D

3.5 cm.

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